• Duration: August 2002-August 2003.
  Attachment: Institute for Infocomm Research, 21 Heng Mui Keng Terrace, Singapore, 119613.
  Position: Research Fellow PhD Student.
  During my stay in Singapore I was under the leadership and advice of Dr.Jianying Zhou who currently is the head of the Internet Security Lab at I2R.
• Duration: February 27th, 2006 - Mayo 27th, 2006
  Attachment: Politecnico di Torino, Torino , Italy.
  Position: Research Fellow PhD Student.
  During my stay in Torino I was under the leadership and advice of Dr. Antonio Lioy who currently leads the TORSEC Security Group.

• Duration: 18-29 July, 2005 (70 hours).
  Venue: University of the Aegean, Chios, Greece.
  Programm: Intensive Programm on Information and Communication Security (IPICS'05). International Summer School.